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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee507d2a9aa7548f3a5ee47be2ddc0f822a66c80f4bfeda6ba45e71fd282dc8' 
  AND token = 'O190fF1IXzBBzsgT6MjBBKpu+l+ajbsWJ1KNuHuU5ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}